After worshiping at the Ultimate Altar of Earth, find the Spirit of Aggregation, a giant ball of stuff rolling around the Four Cities on the main road in a clockwise direction, like the Ambulance. The Spirit, a Katamari, wants things. If you have one, you can Aggregate it into the Spirit for 1 AP (losing it in the process, increasing the size and number of glories. The Spirit will then get bigger, and will want a new item.
There is a (items_aggregated-20)% chance that the collection becomes complete, which gives out all glories thus earned and makes the whole thing start over. In addition to increases from aggregation, the reward increases by 10 glories each day.

Note the Spirit is shared across all players - any person can add to the current Spirit, and the size will increase no matter who adds items to it.

When complete:

Finally, the spirit is satisfied. It launches into the sky, dropping about half it's stuff as it
leaves for ever! The last thing it drops is the seeds of a new spirit.

You receive a portion of the stuff fed to the spirit:

You gain a Rodden Berry.
You gain a Chocolate Mudslide.
You gain 145 Glories.
You gain a Zombie.
You gain 2 Leeches.
You gain a Sun Flower.
You gain a Margherita.
You gain a Feather.
You gain a Bottle of Rum.
You gain a Sextant.
You gain a Basket of Plums.
You gain a Cucumber.

(Note that this is nowhere NEAR half of the stuff that was put in)

Another example (Returned 19/31 items). The turn before completion Spirit had Size:31 and Glory:620

Finally, the spirit is satisfied. It launches into the sky, dropping about half it's stuff as it leaves for ever! The last thing it drops is the
seeds of a new spirit.
You gain a Fire Cracker.
You gain a D6.
You gain a Gin and Tonic.
You gain 621 Glories.
You gain a Leech.
You gain a Daiquiri.
You gain an Olive.
You gain a Bottle of Whisky.
You gain a Bilbo Cocktail.
You gain a Mojito.
You gain a Portion of Chips.
You gain a 3 Iron.
You gain a Pound of Poop.
You gain a Vodka Martini.
You gain a Legolas Cocktail.
You gain a Small Map.
You gain a Feather.
You gain a Glass of Wine.
You gain a 2 Iron.
You gain a Chain.

Repeatability

The quest is repeatable, as long as you can keep up with the Spirit and you have the right items.

Items

While the list of items required are quite random, it is not uncommon to have a quarter of that list involving mixology cocktails and various beverages. Thus, it would be prudent of someone attempting the quest to have the ingredients on hand and possess all beverages that can be bought in the game.